system
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No, it does not have any special meaning in Czech…
Actually avast has its own meaning in english - here is the quote from Merriam-Webster dictionary:
avast – a nautical command to stop or cease
Etymology: perhaps from Dutch houd vast hold fast
Date: 1681
Pavel
So although avast! stops viruses, it is also widely used by pirates (and their parrots) all over the world 